T. Taniguchi, Shinnosuke Kitayama, Hirotaka Okabe, Jumpei G. Nakamura, Akihiro Koda, M. Ishikado, Masaki Fujita
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引用次数: 0
摘要
我们报告了新材料研究揭示的 Pr$_3$Ru$_4$Sn$_{13}$ 的量子临界性。我们通过通量生长法合成了 Pr$_3$Ru$_4$Sn$_{13}$,并通过单 X 射线、粉末 X 射线和粉末中子衍射测量对其进行了表征。该化合物采用了具有立方 Pm$\bar{3}$n 的 Yb$_3$Rh$_4$Sn$_{13}$ 型结构。根据 1 T 时的磁化率估算,每 Pr$^{3+}$ 的有效磁矩为 3.58 $\mu _B$,这表明磁性主要来自 Pr$^{3+}$ 离子。由于相变,比热和磁化率在 $T_{N} = 7.5$ ~ K 时出现异常。μ介子自旋旋转和弛豫($\mu$SR)时间谱在低于 $T_N$ 时显示出明显的振荡。这表明该相是磁有序的。根据初始不对称估计,磁性相的体积分数约为百分之十。此外,在低温下也观察到了自旋波动。这些结果提供了微观证据,证明该材料最接近反铁磁量子临界点,在 Pr$_3$T_4$Sn$_{13}$ ($T= $ Co、Ru、Rh)之间存在部分有序。
We report on the quantum criticality of Pr$_3$Ru$_4$Sn$_{13}$ revealed by our new material research. Pr$_3$Ru$_4$Sn$_{13}$ has been synthesized by flux growth and characterized by single X-ray, powder X-ray, and powder neutron diffraction measurements. The compound adopts a Yb$_3$Rh$_4$Sn$_{13}$-type structure with a cubic Pm$\bar{3}$n. From the magnetization at 1 T, the effective magnetic moment was estimated to be 3.58 $\mu _B$ per Pr$^{3+}$, suggesting that the magnetism is mainly contributed by Pr$^{3+}$ ions. The specific heat and magnetization show an anomaly at $T_{N} = 7.5$ ~ K owing to the phase transition. The muon spin rotation and relaxation ($\mu$SR) time spectra exhibit clear oscillations below $T_N$. This suggests that the phase is magnetically ordered. The volume fraction of the magnetic phase estimated from the initial asymmetry is around ten percent. In addition, spin fluctuations were observed at low temperatures. These results provide microscopic evidence that the material is closest to the antiferromagnetically quantum critical point with a partial order among Pr$_3$$T_4$Sn$_{13}$ ($T= $ Co, Ru, Rh).